I think you should have talked to her and clarifed all issues regarding her past affairs. What she was before marriage was something she was responsible to her parents and no one else. You could have taken all these EXs information before marriage. And now you are married and she is not having any affair. Many a time person falls in love/ infatuation in that tender age which has no base at all.
But now since you had thrown her out , and she went to the police with tons of complaints like 498-A etc , right - just to settle scores with you. Dear , belive me this game has nothing to yield but only money , time and hassasment. i have wasted some 8 yrs of my life in court , though won all cases but this has been very painful.
You have 2 options here :-
1) Think 100 times before you finally go ahead with court and fight all cases and also divorce case in parallel.- Be ready for some 10 yrs when you will be free from all that with a minimal guarantee of winning as you have all allegations like adultery and affairs agaisnt your wife which was before marriage and no proof that she is continuing with all that.
2) Go and talk to her - Just ask if she has any past relations being continued ? or , if she has any love affair still going on with someone? if she says "NO" and ready to move forward with you then you decide what to do.
"Everyone has a past - yes sometimes those past come and disturb your presence and sometime it just disappears..... this was just your wife's mail which were still in her inbox which resulted in all this."
God bless you